Just add the reduced points idea, and move on. Pk mobs won't be a big deal if they don't affect the scoreboard. You want to pk for personal stats, go for it.
You get more points from killing people who haven't died so much in the last x seconds.
or you could do this one, maybe both.
Posted by Aguzo
Spoiler
For pking, I think points should be based off of how many kills you can get, before you die.
(1st kill) If 1 kill, before death = 1
(2nd kill) Then the next kill is 3 x more = 3
(3rd kill) Next is 2x more = 9
(4th kill) 9 x 3 = 27
(5th kill) 27 x 3 = 81
(6th kill) 81 x 3
Rules
1. They have to get each kill in less than 10 seconds, otherwise you start back at 1 point. (So you won't run away, and camp)
2. Your rule from the quote. (Mob pking punishment)
3. Killing guild members and allies reduces points
This way, it rewards people for skill, and not just grinding and spamming sword.
Anyways, changing topics. If there will be a guild hall. Would guilds get statues at the end of the season, or maybe top 3 guilds get banners w/ their guild logos? Based on amount of exp gained for the season.